Communication method, apparatus, and system

Abstract

A communication method, apparatus, and system are provided. The method may include: A terminal apparatus determines first indication information, where the first indication information indicates a status of a multicast/broadcast service, and the status of the multicast/broadcast service includes an inactive state; and the terminal apparatus stops, based on the first indication information, using a first radio network temporary identifier to monitor a physical downlink control channel corresponding to a multicast broadcast traffic channel. In the method, a network apparatus indicates the status of the multicast/broadcast service to the terminal apparatus. When determining that the status of the multicast/broadcast service is inactive, the terminal apparatus may not monitor the physical downlink control channel corresponding to the multicast broadcast traffic channel. This reduces power consumption of the terminal apparatus.

1 . A communication method, comprising:
 determining, by a terminal apparatus, first indication information, wherein the first indication information indicates a status of a multicast/broadcast service, and the status of the multicast/broadcast service comprises an inactive state; and   stopping, by the terminal apparatus based on the first indication information, using a first radio network temporary identifier to monitor a physical downlink control channel corresponding to a multicast/broadcast service traffic channel.   
     
     
         2 . The method according to  claim 1 , wherein the terminal apparatus is in a radio resource control inactive state or idle state. 
     
     
         3 . The method according to  claim 1 , wherein the first indication information is carried on a multicast broadcast control channel. 
     
     
         4 . The method according to  claim 1 , wherein that the terminal apparatus determines that the first indication information indicates that the status of the multicast/broadcast service is the inactive state comprises:
 receiving, by the terminal apparatus, the first indication information from a network apparatus, wherein the first indication information indicates that the status of the multicast/broadcast service is the inactive state.   
     
     
         5 . The method according to  claim 1 , wherein that the terminal apparatus determines that the first indication information indicates that the status of the multicast/broadcast service is the inactive state comprises:
 determining, by the terminal apparatus based on that a multicast session identifier corresponding to the multicast/broadcast service is in a first multicast session identifier set and is not in a second multicast session identifier set, that the status of the multicast/broadcast service is the inactive state, wherein the first multicast session identifier set is an identifier set received by the terminal apparatus before the terminal apparatus receives the second multicast session identifier set.   
     
     
         6 . The method according to  claim 1 , wherein the method further comprises:
 receiving, by the terminal apparatus, configuration information, wherein the configuration information comprises a first parameter, and the first parameter is at least one of the following: a temporary multicast group identifier or a group radio network temporary identifier; and   that the terminal apparatus determines that the first indication information indicates that the status of the multicast/broadcast service is the inactive state comprises:   determining, by the terminal apparatus based on the first parameter, that the status of the multicast/broadcast service is the inactive state.   
     
     
         7 . The method according to  claim 1 , wherein the method further comprises:
 receiving, by the terminal apparatus, multicast broadcast control channel change notification information, wherein the multicast broadcast control channel change notification information indicates a multicast/broadcast service status, or the multicast broadcast control channel change notification information indicates that a multicast/broadcast service status changes, and the multicast/broadcast service status comprises an active state or an inactive state.   
     
     
         8 . The method according to  claim 1 , wherein the method further comprises:
 monitoring, by the terminal apparatus, a physical downlink control channel corresponding to the multicast broadcast control channel, wherein the multicast broadcast control channel carries second indication information, and the second indication information indicates that the status of the multicast/broadcast service is an active state; and/or   monitoring, by the terminal apparatus, a physical downlink control channel corresponding to a paging channel, wherein the paging channel carries a paging message, and the paging message indicates that the status of the multicast/broadcast service is an active state.   
     
     
         9 . A communication method, comprising:
 determining, by the terminal apparatus, third indication information based on information from a multicast broadcast control channel; and   determining, by the terminal apparatus based on the third indication information, that a network apparatus provides a multicast/broadcast service for the terminal apparatus in a radio resource control connected state.   
     
     
         10 . The method according to  claim 9 , wherein the third indication information indicates at least one of the following:
 the network apparatus providing the multicast/broadcast service for the terminal apparatus only in the radio resource control connected state;   the terminal apparatus entering the radio resource control connected state;   the network apparatus not providing the multicast/broadcast service for the terminal apparatus in a radio resource control inactive state or idle state;   waking up the terminal apparatus; or   paging the terminal apparatus.   
     
     
         11 . The method according to  claim 10 , wherein the method further comprises:
 receiving, by the terminal apparatus, configuration information through the multicast broadcast control channel, wherein the configuration information comprises a second parameter, and the second parameter is at least one of the following: a temporary multicast group identifier or a group radio network temporary identifier; and   the determining, by the terminal apparatus, third indication information based on information from a multicast broadcast control channel comprises:   determining, by the terminal apparatus, the third indication information based on the second parameter.   
     
     
         12 . The method according to  claim 10 , wherein the method further comprises:
 receiving, by the terminal apparatus, a third multicast session identifier set and a fourth multicast session identifier set through the multicast broadcast control channel, wherein the third multicast session identifier set is an identifier set received by the terminal apparatus before the terminal apparatus receives the fourth multicast session identifier set; and   the determining, by the terminal apparatus, third indication information based on information from a multicast broadcast control channel comprises:   determining, by the terminal apparatus, the third indication information based on that a multicast session identifier corresponding to the multicast/broadcast service is in the third multicast session identifier set and is not in the fourth multicast session identifier set.   
     
     
         13 . A communication apparatus, comprising:
 a processor, configured to execute computer instructions stored in a memory, to enable the apparatus to perform:   determining first indication information, wherein the first indication information indicates a status of a multicast/broadcast service, and the status of the multicast/broadcast service comprises an inactive state; and   stopping, based on the first indication information, using a first radio network temporary identifier to monitor a physical downlink control channel corresponding to a multicast/broadcast service traffic channel.   
     
     
         14 . The communication apparatus according to  claim 13 , wherein the communication apparatus is in a radio resource control inactive state or idle state. 
     
     
         15 . The communication apparatus according to  claim 13 , wherein the first indication information is carried on a multicast broadcast control channel. 
     
     
         16 . The communication apparatus according to  claim 13 , wherein determining that the first indication information indicates that the status of the multicast/broadcast service is the inactive state comprises:
 receiving the first indication information from a network apparatus, wherein the first indication information indicates that the status of the multicast/broadcast service is the inactive state.   
     
     
         17 . The communication apparatus according to  claim 13 , wherein determining that the first indication information indicates that the status of the multicast/broadcast service is the inactive state comprises:
 determining based on that a multicast session identifier corresponding to the multicast/broadcast service is in a first multicast session identifier set and is not in a second multicast session identifier set, that the status of the multicast/broadcast service is the inactive state, wherein the first multicast session identifier set is an identifier set received by the communication apparatus before the communication apparatus receives the second multicast session identifier set.   
     
     
         18 . The communication apparatus according to  claim 13 , wherein the communication apparatus is further configured to perform:
 receiving configuration information, wherein the configuration information comprises a first parameter, and the first parameter is at least one of the following: a temporary multicast group identifier or a group radio network temporary identifier; and   that the communication apparatus determines that the first indication information indicates that the status of the multicast/broadcast service is the inactive state comprises:   determining based on the first parameter, that the status of the multicast/broadcast service is the inactive state.   
     
     
         19 . The communication apparatus according to  claim 13 , wherein the communication apparatus is further configured to perform:
 receiving multicast broadcast control channel change notification information, wherein the multicast broadcast control a channel change notification information indicates multicast/broadcast service status, or the multicast broadcast control channel change notification information indicates that a multicast/broadcast service status changes, and the multicast/broadcast service status comprises an active state or an inactive state.   
     
     
         20 . The communication apparatus according to  claim 13 , wherein the communication apparatus is further configured to perform:
 monitoring a physical downlink control channel corresponding to the multicast broadcast control channel, wherein the multicast broadcast control channel carries second indication information, and the second indication information indicates that the status of the multicast/broadcast service is an active state; and/or   monitoring a physical downlink control channel corresponding to a paging channel, wherein the paging channel carries a paging message, and the paging message indicates that the status of the multicast/broadcast service is an active state.